<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>欢迎页面</title>
    <style>body {
        font-family: 'Segoe UI', 'Microsoft YaHei', Arial, sans-serif;
        background-color: #f7f7f7;
        color: #333;
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh;
        margin: 0;
        text-align: center;
    }
    .content {
        max-width: 600px;
        padding: 20px;
        background-color: #fff;
        border-radius: 8px;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    }
    .welcome-message {
        font-size: 1.8rem;
        margin-bottom: 20px;
        color: #2c3e50;
    }
    .menu-instruction {
        font-size: 1.2rem;
        color: #7f8c8d;
    }
    .instruction-highlight {
        font-weight: bold;
        color: #3498db;
        cursor: pointer;
        text-decoration: underline;
    }
    .instruction-highlight:hover {
        color: #007acc;
    }</style>
</head>
<body>
    <div class="content">
        <div class="welcome-message">欢迎来到文档索引页面</div>
        <div class="menu-instruction">
            点击左上角的 <span class="instruction-highlight">☰</span> 按钮展开菜单，或直接点击左侧选栏。
        </div>
    </div>
</body>
</html>
